Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa38c253cd14395…

MALICIOUS

PDF

80.0 KB Created: 2021-09-17 22:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a5c30cae355324e8cf3138f29d06b91f SHA-1: a6576e3d366d503489459f7131670332ff3beb15 SHA-256: 3fa38c253cd143954a1ca7b127116cbf5edb2cf6c67dac442a98f86b8dc25c70
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript, which is often used to execute malicious actions within a PDF. Furthermore, it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised WordPress sites, increasing the likelihood of phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3497

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161395e90d5ccf---ruxurebuwaminexeno.pdf In PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/xinazil.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/68449083208.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/zimutikedoronoxido.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/99896333810.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/terodidasivek.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/kademanogax.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/mawewisiruxunu.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/baxetexinoxesiwepu.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/nular.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/sajemo.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/85183387397.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161304f942bdd7---19186466050.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/kexalolebebumawapufuxop.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/e02d3bf5533efee7ef0abc51d04d6a67/76144504094.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210902103517.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/59763711802.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/xumafuxupemavo.pdfIn PDF document text
    • http://timebymtm.com/upload/files/50401266692.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/wazinozusikisavipiwajebe.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/vonapijejuvojew.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/majoxupuxo.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/54390190301.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=news+for+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10261 17436 bytes
SHA-256: c3a93c9224b3882592ba049c33af26513b181d5bc198820936281dadd7968662

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